Prior to lighting off a cold automatically fired auxiliary boiler, you should ().
As for a oil-fired boiler too much air would indicated by ().
Flame failure in an automatically fired auxiliary boiler can from a/an ()
A firebox explosion in an automatically fired auxiliary boiler may be the result of ()
The boiler is fired () the demand for steam exceeds that available from exhaust gas heating.
As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: () (1) secure oil to fires (2) increase feed pump pressure
Prior to lighting off a cold automatically fired auxiliary boiler, yon should ().
Flame failure in an automatically fired auxiliary boiler can from a/an ()
Flame failure in an automatically fired auxiliary boiler can from a/an ()
Prior to lighting off a cold automatically fired auxiliary boiler, you should ().